Thanks Peter. BTW, the contents of the /help directory, I never been
able to figure out how one accesses that information, it seems that it
is meant to be pulled up by some command. 'run-help' doesn't do it,
'man' neither. For example 'test' contains:

test [ arg ... ]
[ [ arg ... ] ]
Like the system version of test. Added for compatibility; use
conditional expressions instead (see the section `Conditional
Expressions'). The main differences between the conditional
expression syntax and the test and [ builtins are: these com-
mands are not handled syntactically, so for example an empty
variable expansion may cause an argument to be omitted; syntax
errors cause status 2 to be returned instead of a shell error;
and arithmetic operators expect integer arguments rather than
arithmetic expressions.
The command attempts to implement POSIX and its extensions where
these are specified. Unfortunately there are intrinsic ambigui-
ties in the syntax; in particular there is no distinction
between test operators and strings that resemble them. The
standard attempts to resolve these for small numbers of argu-
ments (up to four); for five or more arguments compatibility
cannot be relied on. Users are urged wherever possible to use
the `[[' test syntax which does not have these ambiguities.
... and that's possibly useful help, but how do I get to it?